Seagate Technology Incorporated

Qixu David Chen

Rajiv Yadav Ranjan

Charles Chengyea Leu

Ga-Lane Chen

Samuel Dacke Harkness, Iv

Xing Song

Zhong Stella Wu

Thomas P Nolan

Liji Huang

Charles Frederick Brucker

Chung-hee Chang

Connie C Liu

Li-Lien Lee

Shanghsien Alex Rou

Lin Huang

Samuel Dacke Harkness

Kueir-Weei Chour

Jyh-Kau Chang

Tom Nolan

Kaizhong Gao

Erol Girt

Paul Stephen McLeod

Mariana Rodica Munteanu

Chung Yuang Shih

Raj Thangaraj

Phuong Binh Nguyen

Zhong (Stella) Wu

Kuo-Hsing Hwang

Linda Lijun Zhong

Mark Anthony Shows

Xinwei Li

Jeff Duane St John

Jie-Ming Yu

Thanh Thien Ha

Chunghee Chang

Fernando Anaya Chavez

Elsie Yang Chuang

Rajiv Yadau Ranjan

Alexander Hazanov

Stella Z Wu

A perpendicular magnetic recording medium having a dual-layer magnetic film is disclosed. The bottom layer is completely exchange decoupled, and the top layer contains a certain amount of exchange coupling optimized for recording performance. Preferably, the bottom magnetic layer contains stable oxide material (for example, TiO) and other non-magnetic elements (for example, Cr). A method of manufacturing the media is also disclosed.

Method and manufacture process for exchange decoupled first magnetic layer

A recording medium having a substrate, a first soft magnetic underlayer, a second soft magnetic underlayer and a perpendicular magnetic recording layer without a spacer layer between the first and second soft magnetic underlayers is disclosed.

Perpendicular media with dual soft magnetic layers

A media for perpendicular recording and a method of creating the media is provided. The media includes a hard recording layer and a soft underlayer (SUL). The SUL is composed of at least two anti-ferromagnetically coupled (AFC) sub-underlayers. The sub-underlayers respond to a magnetic field established during dynamic reversal with respective magnetic fields. The sub-underlayers are formed and disposed to differ in one or more magnetic moment, anisotropy, and thickness, so that their respective magnetic fields constructively interfere in one or more points in the hard recording layer, thereby reducing a total SUL magnetic field response to the dynamic reversal field approximately to zero at one or more points in the hard recording layer, which reduces side track erasure.

Recording layer and multilayered soft underlayer

The invention relates to a perpendicular magnetic recording medium having a substrate and a seed layer comprising a Ni alloy.

Nickel based alloy layer for perpendicular recording media

Carbon or boron is added into the CoCr layers of a multiplayer perpendicular magnetic media structure to reduce media noise. The perpendicular magnetic media structure has sharp interfaces between Co-alloy layers and Pd or Pt layers and significantly reduced exchange coupling. In accordance with one embodiment of the invention, the perpendicular magnetic media structure with carbon or boron additives is 700 &#x212b; FeCoB/20 &#x212b; TaO/700 &#x212b; FeCoB/20 &#x212b; TaO/700 &#x212b; FeCoB/20 &#x212b; TaO/158 &#x212b; FeCoB/17 &#x212b; Ta/49 &#x212b; ITO/33 &#x212b; CoCrRu/2.5 &#x212b; CO/2.5 &#x212b; C/[(CoCr)C/Pd]/50 &#x212b; CHN. [(CoCr)C/Pd]means 19 layers of the bi-layer stack (CoCr)C/Pd. TaOstands for surface-oxidized Ta and COstands for C oxides. ITO stands for Indium Tin Oxide and consists of InOand SnOat 80 and 20 molecular percent respectively. CHN refers to hydrogenated and nitrogenated carbon.

Multilayer perpendicular media with high-boron or high-carbon additives to CoCr films

A perpendicular magnetic recording medium including an interlayer structure for crystallographically orienting a layer of a hexagonal close-packed (hcp) perpendicular magnetic recording material formed thereon, comprising in overlying sequence from a surface of a magnetically soft underlayer:

Highly oriented perpendicular magnetic recording media

A magnetic recording medium, the order of layers in which is the substrate, the soft underlayer, the seedlayer, the 1RuCr-containing interlayer, the 2RuCr-containing interlayer and the magnetic recording layer with preferably a oxides or nitrides-containing magnetic layer comprising grains, is disclosed. High-chromium ruthenium-chromium alloy used as inter layers significantly enhances coercivity and SMNR preferably due to the improved lattice match between RuCr inter layers and CoPt-based magnetic recording layers, and the surface energy of RuCr layers contributes to the performance improvement with the high-chromium addition into Ru inter layers.

Inter layers for perpendicular recording media

A perpendicular magnetic recording medium, comprising:

Perpendicular magnetic recording media with improved crystallographic orientations and method of manufacturing same

A granular perpendicular magnetic recording medium having a surface treated magnetic layer comprising an oxidized or nitrogenized boundary layer formed on the surface of the magnetic layer, wherein the magnetic layer comprises granular magnetic regions having oxygen and/or nitrogen-containing grain boundaries. In one embodiment, the granular perpendicular recording medium further comprises a soft magnetic layer below the surface treated granular magnetic layer and a protective overcoat over the surface treated granular magnetic layer. A method of manufacturing a granular perpendicular magnetic recording medium includes depositing a magnetic layer having granular structure over a substrate and subsequently surface treating the granular magnetic layer in an oxygen and/or nitrogen-containing atmosphere to produce an oxidized and/or nitrogenized boundary layer formed on the surface of the granular magnetic layer. The granular perpendicular magnetic recording medium of the present invention exhibits high Hc and SNR while exhibiting improved corrosion resistance and contact start-stop performance.

Granular perpendicular media with surface treatment for improved magnetic properties and corrosion resistance

High-saturation magnetization composite soft magnetic films can be deposited with sintered targets made of preferably at least two kinds of powders/elements with much lower saturation magnetization than that of the deposited soft magnetic films. Such a high-saturation magnetization composite soft magnetic film can be deposited by sputtering a plurality of species from a sintered target that forms a film of a material of higher saturation magnetization than that of the species.

Sputtering target and method for making composite soft magnetic films with a sintered target

Magnetic recording media having a magnetic layer with an easy magnetization axis lying about 45&#xb0; out of plane of the magnetic layer is disclosed. SMNR from this media could be greatly improved from conventional longitudinal and perpendicular recording, because of an increase in the grain anisotropy that could be effectively written due to the angled recording configuration, resulting also in higher thermal stability, therefore, suitable for higher areal density recording.

Tilted recording medium design with (101-2) orientation

A magnetic recording medium containing a B-2 structured ruthenium-aluminum underlayer comprising a (200) crystallographic orientation with a thickness from about 50 &#x212b; to about 800 &#x212b;, and a magnetic layer with a Co(11.0) crystallographic orientation, and a method of making the same are disclosed. The medium deposited on mechanically textured and surface-oxidized NiP film has a relatively high remanent coercivity and a relatively high signal to medium noise ratio even at low OR-Mrt.

Ruthenium-aluminum underlayer for magnetic recording media

A bi-crystal magnetic recording medium, i.e., medium with Cr(200) and Co(11.0) orientations, having a CrW-containing underlayer in which the W content increases for improved lattice matching with a Co-alloy magnetic layer has high coercivity, high SMNR and high areal recording density.

Recording medium with a varying composition underlayer

Laminated magnetic recording medium with two Co-containing layers separated by a non-magnetic interlayer is stablished by Ru-containing layers between the recording layers and Co-containing stablization layers through antiferromagnetic coupling.

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Milpitas, CA, United States of America

Qixu David Chen